How long is the flight from Idaho to London?

A quick flight from Idaho to London can take about 15h 38m. United Airlines provides one of the quickest options available for as low as £556. The distance from Idaho to London is about 4705 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Idaho to London?

While some choose either Spokane - London Gatwick or Spokane - London Heathrow, Boise Air Term. Gowen Fld - London Heathrow is the most popular route from Idaho to London.

What is the cheapest time of day to fly from ID to LON?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to London as you normally would.

Can I find deals for flights from Idaho to London that include hotel bookings?

Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Idaho to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.

Can I find deals for business class flights from Idaho to London?

Yes. Cheapflights offers flight deals from Idaho to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£240+ Cheap Flights from Idaho to London

Cheap flight deals from Idaho to London

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2026.

Sun 27/915:21 -

1 stop13h 54m

Tue 13/1008:15 -

2 stops21h 14m

Deal found 15/9£527

Wed 28/1014:51 -

1 stop12h 49m

Wed 4/1113:00 -

2 stops29h 31m

Deal found 13/9£547

Wed 28/1013:05 -

2 stops16h 35m

Wed 4/1106:20 -

2 stops22h 50m

Deal found 13/9£550

Mon 21/912:38 -

1 stop14h 42m

Tue 6/1011:45 -

2 stops17h 25m

Deal found 14/9£550

Mon 21/914:11 -

1 stop16h 04m

Tue 6/1008:55 -

2 stops21h 09m

Deal found 14/9£550

Tue 29/908:15 -

1 stop19h 55m

Wed 7/1007:25 -

2 stops19h 04m

Deal found 15/9£553

Sun 27/908:15 -

1 stop16h 10m

Tue 13/1011:25 -

1 stop13h 18m

Deal found 15/9£554

Mon 21/907:02 -

1 stop22h 48m

Tue 6/1008:55 -

1 stop20h 34m

Deal found 14/9£555

Mon 21/917:49 -

1 stop13h 46m

Tue 6/1011:40 -

1 stop15h 05m

Deal found 14/9£555

Mon 28/918:57 -

1 stop33h 03m

Tue 13/1010:55 -

1 stop14h 21m

Deal found 14/9£556

Wed 28/1013:25 -

1 stop13h 35m

Tue 3/1111:30 -

2 stops20h 29m

Deal found 16/9£556

Mon 30/1113:12 -

1 stop13h 48m

Mon 7/1220:25 -

2 stops30h 06m

Deal found 15/9£557

Best flights from Idaho to London
Discover carefully curated flight deals from Idaho to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2026.

Tue 29/906:25 -

1 stop23h 00m

Wed 7/1007:25 -

2 stops19h 04m

Deal found 16/9£553

Mon 28/918:57 -

2 stops15h 38m

Tue 13/1020:05 -

2 stops33h 05m

Deal found 14/9£556

Wed 2/1207:25 -

2 stops16h 40m

Mon 7/1217:50 -

2 stops29h 45m

Deal found 16/9£560

Wed 14/1016:24 -

1 stop14h 36m

Wed 21/1011:40 -

1 stop13h 18m

Deal found 15/9£561

Tue 2/308:47 -

1 stop20h 33m

Fri 5/314:45 -

1 stop14h 35m

Deal found 12/9£562

Wed 28/1007:00 -

1 stop17h 05m

Wed 4/1112:20 -

1 stop14h 25m

Deal found 13/9£562

Wed 2/1214:30 -

2 stops20h 10m

Mon 7/1209:50 -

2 stops18h 23m

Deal found 13/9£670

Wed 18/1106:00 -

2 stops24h 00m

Wed 25/1107:40 -

2 stops21h 11m

Deal found 16/9£772

Wed 14/1016:41 -

2 stops13h 59m

Wed 21/1015:40 -

2 stops40h 15m

Deal found 15/9£817

Sun 27/908:15 -

1 stop16h 10m

Tue 13/1011:25 -

1 stop13h 18m

Deal found 15/9£554

Wed 14/1013:00 -

1 stop18h 35m

Wed 21/1011:45 -

2 stops20h 05m

Deal found 15/9£557

Wed 7/1015:36 -

1 stop16h 59m

Tue 13/1012:25 -

1 stop18h 34m

Deal found 17/9£561

Tue 2/309:14 -

1 stop19h 06m

Fri 5/314:45 -

1 stop16h 12m

Deal found 12/9£562

Tue 29/911:03 -

2 stops19h 02m

Wed 7/1006:30 -

2 stops17h 44m

Deal found 13/9£560

Mon 7/1206:00 -

1 stop23h 20m

Wed 9/1214:45 -

1 stop31h 22m

Deal found 14/9£566

Tue 2/313:45 -

2 stops34h 45m

Fri 5/306:35 -

2 stops25h 03m

Deal found 16/9£570

Wed 11/1113:12 -

2 stops15h 28m

Sun 15/1120:25 -

2 stops26h 58m

Deal found 13/9£597

Wed 28/1013:49 -

2 stops20h 51m

Tue 3/1109:50 -

2 stops19h 21m

Deal found 14/9£670

Wed 18/1107:00 -

2 stops17h 35m

Wed 25/1108:40 -

2 stops19h 29m

Deal found 16/9£560

Wed 7/1006:09 -

1 stop25h 56m

Tue 13/1017:00 -

1 stop29h 20m

Deal found 14/9£570

Sat 3/1018:50 -

1 stop33h 20m

Mon 12/1013:05 -

2 stops17h 54m

Deal found 15/9£607

Mon 8/208:40 -

1 stop19h 00m

Wed 17/206:30 -

2 stops16h 30m

Deal found 15/9£564

Wed 28/1012:55 -

2 stops16h 00m

Wed 4/1111:55 -

2 stops17h 40m

Deal found 13/9£762

Mon 11/114:45 -

2 stops19h 55m

Thu 14/109:50 -

2 stops18h 45m

Deal found 16/9£739

Thu 12/1110:37 -

1 stop16h 03m

Mon 16/1106:35 -

2 stops21h 22m

Deal found 13/9£645

Tue 17/1107:25 -

2 stops19h 00m

Sun 22/1106:20 -

2 stops17h 03m

Deal found 15/9£597

Sun 25/1012:49 -

2 stops45h 41m

Mon 2/1114:00 -

2 stops38h 40m

Deal found 15/9£795

Mon 2/1112:31 -

2 stops22h 09m

Wed 2/1209:50 -

2 stops19h 02m

Deal found 15/9£769

Sun 10/107:00 -

1 stop19h 40m

Mon 18/106:35 -

2 stops38h 00m

Deal found 15/9£651

Sun 4/1006:45 -

1 stop21h 35m

Mon 12/1014:30 -

1 stop15h 34m

Deal found 13/9£599

Find flight deals from Idaho to London

Round-trip from	£527
One-way from	£240
Popular in	January
Cheapest in	April
Average price	£712

American Airlines
27/9-13/10
3 total stops
35h 08m total
Idaho to London

Search Deals

Virgin Atlantic
29/12-31/12
1 total stop
20h 35m total
Idaho to London

Search Deals

Highest demand for flights based on searches. 31% potential increase in price (£296 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 17% potential price decrease (£97 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 10/3

08:40-10:40

1 stop19h 00m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£248

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Wed 10/3

05:00-05:55

2 stops17h 55m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£248

SpokaneLondon

GEG Spokane - LHR London Heathrow

GEGLHR

Spokane

Sat 13/3

16:00-21:20

2 stops21h 20m

London Heathrow

Wed 31/12

00:00-15:00

Nonstop0h 00m

£253

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

14:00-12:20

1 stop15h 20m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£286

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Thu 11/3

13:43-11:40

1 stop14h 57m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£286

BoiseLondon

BOI Boise Air Term. Gowen Fld - LGW London Gatwick

BOILGW

Boise Air Term. Gowen Fld

Fri 1/1

13:10-15:45

2 stops19h 35m

London Gatwick

Wed 31/12

00:00-16:00

Nonstop0h 00m

£289

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

07:00-08:30

2 stops18h 30m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£292

BoiseLondon

BOI Boise Air Term. Gowen Fld - LHR London Heathrow

BOILHR

Boise Air Term. Gowen Fld

Fri 12/3

07:00-11:20

2 stops21h 20m

London Heathrow

Wed 31/12

00:00-16:00

Nonstop0h 00m

£292

BoiseLondon

BOI Boise Air Term. Gowen Fld - LCY London City

BOILCY

Boise Air Term. Gowen Fld

Fri 1/1

05:30-08:10

2 stops19h 40m

London City

Wed 31/12

00:00-16:00

Nonstop0h 00m

£299

BoiseLondon

BOI Boise Air Term. Gowen Fld - LGW London Gatwick

BOILGW

Boise Air Term. Gowen Fld

Wed 10/3

12:42-15:45

2 stops20h 03m

London Gatwick

Wed 31/12

00:00-16:00

Nonstop0h 00m

£304

Flights are sorted by cheapest return flights first.

Deals found on 13/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho with our price prediction graph.

BOI-LHR

IDA-LHR

GEG-LHR

JAC-LHR

JAC-LCY

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to London

USID-LON

BOI-LHR

IDA-LHR

GEG-LHR

JAC-LHR

What is the cheapest month to book a flight from Idaho to London?

Currently, November is the cheapest month in which you can book a flight from Idaho to London (average of £518). Flying from Idaho to London in January is currently the most expensive (average of £1,503). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Idaho to London?

Airfare is below average for this route at the moment.

Idaho to London flights typically cost between £642 and £915 in September.
The cheapest return price found within the last 5 days was £527 on American Airlines (27 Sept–13 Oct).

Related info for your journey

How long is the flight from Idaho to London?
A quick flight from Idaho to London can take about 15h 38m. United Airlines provides one of the quickest options available for as low as £556. The distance from Idaho to London is about 4705 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most popular routes from Idaho to London?
While some choose either Spokane - London Gatwick or Spokane - London Heathrow, Boise Air Term. Gowen Fld - London Heathrow is the most popular route from Idaho to London.
Can I find deals for flights from Idaho to London that include hotel bookings?
Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Idaho to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.
Can I find deals for business class flights from Idaho to London?
Yes. Cheapflights offers flight deals from Idaho to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Idaho to London?
Currently, November is the cheapest month in which you can book a flight from Idaho to London (average of £518). Flying from Idaho to London in January is currently the most expensive (average of £1,503). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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How does Cheapflights help users find flights from Idaho to London?

When you search for this flight from Idaho to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Idaho to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Idaho to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Idaho to London with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Idaho to London flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Idaho to London become cheaper?

Of course! You can now track prices for flights from Idaho to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Cheap flights from Idaho to London from £240

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Idaho to London

Cheapest flights from Idaho to LondonExplore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2026.

Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2026.

Best flights from Idaho to LondonDiscover carefully curated flight deals from Idaho to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2026.

Discover carefully curated flight deals from Idaho to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2026.

Last-minute flights from Idaho to LondonDiscover last-minute flight deals from Idaho to London. Data last updated 17 September 2026 and is based on user searches.

Discover last-minute flight deals from Idaho to London. Data last updated 17 September 2026 and is based on user searches.

One-way flights from Idaho to LondonSearch for one-way flight options from Idaho to London. Find affordable one-way fares based on user searches. Data last updated 17 September 2026.

Search for one-way flight options from Idaho to London. Find affordable one-way fares based on user searches. Data last updated 17 September 2026.

Find flight deals from Idaho to London

Round-trip from

One-way from

Popular in

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Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Idaho to London that are best for you.

Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from Idaho to London?

How much does it cost for a return flight from Idaho to London?

Airfare is below average for this route at the moment.

Idaho to London flights typically cost between £642 and £915 in September.The cheapest return price found within the last 5 days was £527 on American Airlines (27 Sept–13 Oct).

Related info for your journey

How long is the flight from Idaho to London?

What are the most popular routes from Idaho to London?

Can I find deals for flights from Idaho to London that include hotel bookings?

How can I find direct flights from Idaho to London?

Can I find deals for business class flights from Idaho to London?

What is the cheapest month to book a flight from Idaho to London?

Travelling to a place near London?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to London

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to London by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to England

Book a non-stop flight to one of these other cities located in England.

Search flights from Idaho to London by cabin class

Find flights from Idaho to London, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 17 September 2026.

Idaho and London flights

Browse other Idaho and London flight options. Last updated on 17 September 2026.

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How does Cheapflights help users find flights from Idaho to London?

Why should you use Cheapflights to find cheap flight tickets from Idaho to London?

Can Cheapflights find flights from Idaho to London with no change fees?

Can Cheapflights notify me if prices for flights from Idaho to London become cheaper?

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Travel Smart

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 September 2026.

Best flights from Idaho to London
Discover carefully curated flight deals from Idaho to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2026.

Last-minute flights from Idaho to London
Discover last-minute flight deals from Idaho to London. Data last updated 17 September 2026 and is based on user searches.

One-way flights from Idaho to London
Search for one-way flight options from Idaho to London. Find affordable one-way fares based on user searches. Data last updated 17 September 2026.

Idaho to London flights typically cost between £642 and £915 in September.
The cheapest return price found within the last 5 days was £527 on American Airlines (27 Sept–13 Oct).